<template>
  <div>
    <el-form
      ref="loginFormRef"
      :model="loginForm"
      :rules="rules"
      v-loading="loading"
      element-loading-text="登录中"
      label-width="80px"
      class="login-box"
    >
      <h3 class="login-title">欢迎登录</h3>
      <el-form-item label="账号" prop="user_name">
        <el-input type="text" placeholder="请输入账号" v-model="loginForm.user_name" />
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input type="password" placeholder="请输入密码" v-model="loginForm.password" />
      </el-form-item>
      <el-form-item>
        <el-button type="primary" v-on:click="onSubmit('loginFormRef')">登录</el-button>
        <el-button type="primary" v-on:click="register">注册</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      loginForm: {
        user_name: '',
        password: ''
      },
      loading: false,
      // 表单验证，需要在 el-form-item 元素中增加 prop 属性
      rules: {
        user_name: [
          { required: true, message: '账号不可为空', trigger: 'blur' }
        ],
        password: [{ required: true, message: '密码不可为空', trigger: 'blur' }]
      }
    };
  },
  methods: {
    register() {
      this.$router.push('/register');
    },
    onSubmit(formName) {
      // 为表单绑定验证功能
      this.$refs[formName].validate(async valid => {
        if (!valid) return;

        this.loading = true;
        const { data: res } = await this.$http.post(
          'user/login',
          this.loginForm
        );
        console.log(res);
        this.loading = false;

        if (res.code === 0) {
          window.sessionStorage.setItem(
            'login_user_name',
            this.loginForm.user_name
          );

          window.sessionStorage.setItem(
            'login_user_type',
            res.data.user_type
          );

          window.sessionStorage.setItem(
            'login_user_id',
            res.data.id
          );

          // 使用 vue-router 路由到指定页面，该方式称之为编程式导航
          this.$router.push('/home');
        } else {
          this.$message({
            showClose: true,
            message: res.msg,
            center: true,
            type: 'error'
          });
        }
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login-box {
  border: 1px solid #dcdfe6;
  width: 350px;
  margin: 180px auto;
  padding: 35px 35px 15px 35px;
  border-radius: 5px;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  box-shadow: 0 0 25px #909399;
}

.login-title {
  text-align: center;
  margin: 0 auto 40px auto;
  color: #303133;
}
</style>
